Abstract
The anchoring and repelling of spiral waves in a two-dimensional homogeneous excitable medium in the presence of a localized defect is studied in the framework of a numerical model and the kinematical theory. Depending on the relative initial distance between the obstacle and the core center, the vortex is observed either to drift towards the obstacle or to move away from it. The anchoring phenomenon is explained in terms of periodic perturbations of the front curvature, while the repulsion is rather connected with inhomogeneous refractoriness, which affects the spiral tip motion.
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